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J. R. CUMMINGS. ELECTRICAL APPARATUS. APPLICATION nun nc.2. ma.

1,31 0,063. Patented July 15, 1919.

. Inventor: Joseph R. Cummings.

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H's Attorney.

Tun COLUMBIA PLANOGRAI'N co, wAsmNa'mN. D. c.

UNITED STATES PATENT OFFICE.

JOSEPH R. CUMMINGS, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR 'I'O GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL APPARATUS.

Application filed December 2, 1918.

To all whom it may concern:

Be it known that I, JOSEPH R. CUMMINGS, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Electrical Apparatus, of which the following is a specification.

My invention relates to electrical apparatus such as transformers, some reactances and the like, in which a lurality of Separate windings are assembled on a core of magnetic material, and has for its object an improved construction therefor whereby such apparatus may be more readily and more economically manufactured than heretofore.

Transformers, reactances, etc., have heretofore generally had the leads at the ends of the winding coils tied in with insulating tape, string or the like which was subsequently enveloped by the jacket of insulating material formed about the coil. For very high voltages this practice is not altogether satisfactory because it forms small pockets from which it is difiicult to displace all the air, and are, with corresponding difiiculty, thoroughly impregnated with such insulating compound which it is now customary to apply to electrical windings assembled in such apparatus.

In the practice of my invention such taping and tyin in of leads with the consequent liability of reak down at these points are done away with for I rovide an exterior housing or boxing of insulating material which securely holds the leads when the windings are in assembled relation, such boxing being also designed to serve as a spacing device in conjunction with the regular spacing means ordinarily employed. The windings, therefore, can be securely held in predetermined spaced relations when assembled without having any of the passages, which are provided for the circulation of a cooling and ventilating medium, unduly restricted at any point.

For a more complete understanding of the nature and objects of my invention, reference should be had to the following detailed description taken in connection with the accompanying drawing in which:

Figure 1 is a View partly in section and artly in elevation of a winding in assembled relation in which my invention is embodied; Fig. 2 in a sectional view taken on Specification of Letters Patentv Patented July 15, 1919.

Serial No. 285,047.

the line 2-2 in Fig. 1; Figs. 3, 4, 5 and (3 are perspective views of related disk windings having my invention applied thereto, and Fig. 7 is a perspective view of the boxing used to anchor the lead in accordance with my invention.

Referring now to Fig. 1, 10 denotes a core, on a leg 11 of which are mounted the windings 12. These windings here shown are disk coils, spaced uniformly from each other by spacing devices comprising U shaped members 13 slipped over the inner edge of coils, reinforced by tillers ll. ob lars 15 of insulating material will be inserted between coils, shown where it is desired to provide greater crccpagc and strikin distance between coils than is obtained by merely stacking the windings so that the sides of the spacing devices abut.

Inner and outer insulating cylinders are shown at 16 and 17 respectively for protecting the windings from the core and the easing. For a like reason the interposed insulation is shown employed at 18 at the ends of the cylinders 16 and 17.

The construction which I have just doscribed is no part of my present invention but is the construction commonly employed in apparatus of this type. I will now describe the improved arrangemcnt for securing or anchoring leads in accordance with my invention.

At the point from which a lead is to be taken out from a coil, as shown at P in Figs. 2 and 3, I slip over a U-shaped mom bcr 16, the base of the U, indicated at 17, serving as a binding member to hold in the end of the lead 18. Over the member 16, I slip a second outer U-shaped member 19 from over the other edge of the winding, so that there is mutual friction between the interfitting parts of the boxing thus formed by these two members which assists in securing the lead in place.

t is now seen that the manufacture of windings for electrical apparatus is materially expedited by the use of my invention for it is no longer necessary to employ the tedious method of tying in leads formerly resorted to, but when the coil is wound with the proper number of turns, the coil is merely boxed at the point where the lead is to enter to kee the last turn from peeling off, as it were, roin the other turns.

When a winding having my boxing for loads is assembled and im 'n'cgnated or coated with an insulating compound, such boxing becomes fairly cemented to the coil resulting in a very rigid construction which is more than capable of withstanding all the strains which ordinarily occur in the type of service for which the windings are designed.

The use of the two members 16 and 19 in the lead boxing results in a spacin device extending the same distance away rom the surface of the coils as the filled U-spacers 13, so that the windings may e stacked without the use of any spacing devices other than the boxing adjacent the point where the lead is brought out.

It is obvious that a boxing such as I have described may be used for holding the inside lead of a coil as well as the outside one such as here shown, but where the windings are built about an interior insulating cylinder or form, as is frequently the case, the practice generally followed in making the inside connection would employ a diagonal cross-over such as shown at 20 in Fig. 3.

In Fig. l I have illustrated the application of a boxing 26-29 to hold in a lead 28 comprising a plurality of strands of conductor in parallel. The inside connection is here again shown as a diagonal crossover 30.

I11 Fig. 5 I have shown my boxing as applied to hold in still another form of conducting lead commonly used in windings, namely a flat conductor formin the lead 38 held in by the boxing 3(3-39. lhe diagonal cross-over 40 is here again used for the inside connection.

In Fig. 6 I have shown how my invention would be applied where a plurality of strands of flat conductor in parallel radially are employed. In such instances it is preferable to bring out the multiple strands, one at each of a plurality of points as indicated at 48, 48 and 48, and apply a boxing to each as indicated at 4:9, 49' and 49". Diagonal cross-overs 50 are again used for the inside connections, Such connections, in this instance, bein preferably made as set forth in the U. patent of Frank and Dwyer, No. 1,253,166, issued January 8, 1918.

While I have here shown and described several embodiments of my invention which are at present the best means known to me for carryin the same into effect, I would have it an erstood that they are merely illustrative and that I do not mean. to be limited thereby to the precise details shown,

nor in the choice of equivalent arrangements except as defined in my claims hereunto annexed.

What I claim. as new and desire to secure by Letters Patent of the United States, is,-

1. In an electrical apparatus, the com bination with coils of winding in assembled relation, of a combined lead anchoring and spacing device.

2. In an electrical apparatus, the combination with coils of winding in assembled relation, of a spacing device comprising an insulating boxing formed about a coil at a point where a lead emerges.

3. In an electrical apparatus, the combination, with coils of winding in assembled relation, of a frietionally retained boxing formed on a coil at a point where a lead emerges having dimensions enal'iliug it to serve as a spacing device.

1. In an electrical apparatus, the combination with coils of winding in assembled relation, of an insulating boxing comprising separable mutually engaging parts girdling a coil at a point where a lead emerges.

5. In an electrical apparatus, the combination with coils of winding in assembled relation, of a spacing device comprising two interfitting U-shaped members slipped over a coil from opposite sides at a point where a lead emerges.

6. In an electrical apparatus, the combination with coils of winding in assembled relation, oftwo interfitting U-shaped members of insulating material arranged to house a coil at a point where a lead en'iergcs, the combined height from the surface of the coil of said members being that of the spacing devices elsewhere employed about the coil.

7. In an electrical apparatus, the combination with disk coils in assembled relation, of a U -shaped member slipped over the edge of a coil at a point where a lead emerges, and a second intcrfitting U-shaped member slipped over the coil from. the other edge and arrangedto form a housing about the coil to secure said lead in place.

8. In an electrical apparatus, the combination with dislrcoils in assembled relation, of radially disposed spacing devices disposed between said coils, and lead anchoring means formed to house said coils at points where the leads emerge comprising interfitting members girdling each coil and formed to serve as spacing devices at such points. i

In witness whereof, I have hereunto. set my bandit-i 27t day o v mber 1 JOSEPH R. CUMMINGS. 1

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